
(Jan 18th, now that I looked) Ever since that patch, and I mean effective immediately after the patch downloaded, the game consistently freezes at the startup screen and has crackling sound during the load screens between levels in single player. When I reloaded the game, a patch downloaded for MW2. (It's happened before, this wasn't abnormal) Anyways, it wasn't malware or anything, and I had to close MW2 after popup because it just wouldn't go back into the game after being tabbed out. Can't remember what it was, something like anti-virus new version spam or something. I was playing the game for a few minutes right before the patch, and I had some kind of popup on the desktop that booted me out.

Around a week ago, Steam downloaded a patch for the game and my install has been screwed since then. I don't have much time to play it, but I've been working my way through the single player and the special ops missions. So I've had MW2 installed for about a month.
